Thank you, I'm glad you enjoyed it! Thankfully, knowing players could potentially get stuck is why I included the manual. xD
But yeah, I was iffy on what to do for it, and initially just had the hall all wood before adding that one tile difference. I think once I can work on it again, I'll make some more sprites and take your suggestion to give it a door that'll be easily seen.I didn't want to use the same door sprite from one cutscene, as I was worried the player wouldn't realize what it is.
Maybe little folded doors that are open would be the best looking visual cue, and turning that one blue tile into a little rug.
Another thing I'll have to do is edit the walkthrough and rewrite it for better clarity, since I was informed that it isn't as transparent as I thought it was.